“All those traffic that will arrive to srx interface other then reth0.0 use global defination.”Where to find this global definition

Your original configuration shows that reth0.0 is assigned to the Main-VR. Thus any traffic that arrives on this sub interface will be processed by the Main-VR routing table. Traffic that arrives on any other interface will be procesed by the root routing instance.

Link = the physical layer link is down meaning the cable is not good or disconected or the partner interface is not up.

Since this is a reth interface you may also want to confirm the status of the underlying physical ethernet port. Look at the interface stanza and see which physical port is assigned to reth4 and also run the show interface terse for this physical interface to confirm it is admin up.

If no interface is assigned to reth4 then one will need to be assigned and connected to the desired partner device.